Hardin had been at Penn State since 2003 and the Bellisario College dean for more than 10 years.
Gladieux previously played for the United States team in the Paris 2024 Olympics.
Ryan spent three-and-a-half years studying civil engineering and competing in club gymnastics at Minnesota.
Mingo is a top-10 point guard nationally in the Class of 2025.
"We're close, but that doesn't count when you play college basketball."
Lyon became the second transfer to commit to the Nittany Lions this offseason.